A) lipids
B) biological fluids
C) fats
D) enzymes
Correct Answer: B
Solution :
Na, K, Mg and Ca are vital elements. Their ions are present in biological (body) fluids. \[N{{a}^{+}}\]and\[C{{a}^{2+}}\]ions are present mainly in extracellular region (outside the cell). On the other hand,\[{{K}^{+}}\]and\[M{{g}^{2+}}\]ions are found inside the animal cells.
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